Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	$ 578	$ 452	$ 1,082	$ 827
Income tax effect	225	175	420	320
Pre-tax stock-based compensation expense, net of forfeitures and associated income tax effect	353	277	662	507
Stock-Based Compensation (Textual) [Abstract]
Federal statutory rate			35.00%
Stock options [Member]
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	16	18	31	35
Restricted stock [Member]
Components of pre-tax stock-based compensation expense, net of forfeitures, and associated income tax effect
Pre-tax stock-based compensation expense	$ 562	$ 434	$ 1,051	$ 792
Restricted stock unit, time-based awards [Member]
Stock-Based Compensation (Textual) [Abstract]
Vesting period of stock-based compensation awards			3 years
Restricted stock unit, performance based awards [Member]
Stock-Based Compensation (Textual) [Abstract]
Vesting period of stock-based compensation awards			3 years